Polemonium caeruleum
Jacob's ladder
Flower Color
Description
A clump-forming perennial to 90cm tall, with ladder-like, pinnate mid-green leaves composed of leaflets, and stiff stems bearing sprays of blue flowers 2.5cm wide with prominent yellow stamens in early summer; often seeds about rather freely
Mature Height
1m
Mature Spread
0.5m
Plant Characteristics
Foliage
Deciduous
Growth Habit
Clumping
Growth Speed
Moderate · 0.3 m/yr
Soil Texture
ClayLoamSand
Soil pH
AcidAlkalineNeutral
Soil Moisture
Moist but well-drained
Hardiness (RHS)
H9
Hardiness (USDA)
Zones 2-7
Flowering Season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Key Features
Generally pest-freeCoastalWildlife gardensWildflower meadowCity and courtyard gardensCottage and informal gardenFlower borders and beds